512 Records of the Indian Museum. [Vol. VIII, 



Hab. — Between Ranging and Rotung, 2200 ft., Abor country. 



Type No. 5998 Ind. Mus. ; also No. 6135 I.M. 



This new species is a very interesting addition to the Indian 

 fauna, a single full-grown specimen and one immature of which 

 were collected by I. H. Burkill and sent home by Mr. Kemp, who 

 accompanied the expedition. It is the first sinistral form of the 

 section Endoplon I have seen. In its parietal armature it is nearest 

 to P. hrachyplecta, but lacks the median horizontal fold of that 

 species, while the anterior vertical plate is only about half the 

 length of that in its ally ; in addition it possesses a short hori- 

 zontal fold proceeding from the upper extremity of the posterior 

 plate, while the horizontal fold below the two plates — which in P. 

 brachyplecta is very short and rather stout — is here very slender 

 and, running parallel with the lower suture, reaches the aper- 

 ture. In its palatal armature it differs in having only five folds — 

 against six in hrachyplecta — the median ones, moreover, being 

 placed more vertically, and the third and fourth having the ante- 

 rior side concave, instead of sloping backwards as in brachyplecta. 

 In outward appearance it strikingly differs from all other known 

 species of Plectopylis , the terraced upper sides of the narrow whorls 

 and the channelled sutures in the umbilicus being features I have 

 not observed in any other species, and which, without previous 

 examination of the armature, enabled me at a glance to recognize 

 this as an undescribed form. 



Fig. 3« shows the parietal armature, fig. 36 the palatal folds 

 as they would appear from the inside if the outer wall were 

 removed, while fig. 3c gives the posterior aspect of both parietal 

 and palatal barriers, only the posterior plate of course being vis- 

 ible in this view. 



Plectopylis (Sinicola) babbagei, sp. n. 



(PI. xlii, figs. 4, 4a, 46, 4c, 4^). 



Shell dextral, discoid, dark brown above, olivaceous corneous 

 below, widely and perspectively umbilicated, closely and rather 

 coarsely plicate-striate, the striae decussated b}' raised spiral lines. 

 Whorls 6, increasing slowly at first, then more rapidly, the 

 upper side a little flattened and sloping towards the suture, 

 slightly convex at the side, tumid below, encircled by three fim- 

 briae of deciduous cuticular processes, like coarse hairs, the first 

 near the upper side, the second at the periphery, the third around 

 the umbilicus ; the last whorl dilated towards the mouth, not 

 constricted behind the peristome, shortly descending in front. 

 Suture impressed, spire slightly sunken, apex a little raised. Aper- 

 ture oblique, elliptic-subovate, the margins distant ; peristome 

 white, thickened and reflexed, the margins united by a slightly 

 raised, flexuous ridge on the parietal wall; the upper margin 

 shortly ascending, curved, outer margin straight, basal margin 

 widely curved, columellar margin ascending, slightly impinging 

 upon the umbilicus. 



